Specifications

Troubleshooting (OP: Unified ON/OFF Controller) Si34-704
306 Troubleshooting
[CHECK 4] Power Transistor Check
Perform the following procedures prior to check.
(1) Power Off.
(2) Remove all the wiring connected to the PCB where power transistors are mounted on.
[Preparation]
·
Tester
∗ Preparing a tester in the analog system is recommended.
A tester in the digital system with diode check function will
be usable.
[Point of Measurement and Judgment Criteria]
·
Measure the resistance value using a tester at each point of measurement below, 10 minutes later after power OFF.
To use analog tester:
Measurement in the resistance value mode in the range of
multiplying 1kΩ.
Point of Measurement
Judgment Criteria Remarks
+–
No.
15kΩ and
above
(including )
2 ~ 15kΩ
2 ~ 15kΩ
Due to condenser charge
and so on, resistance
measurement may require
some time.
P2
P2
P2
U
V
W
N3
N3
N3
U
V
W
1
2
3
4
5
6
7
8
9
10
11
12
P2
P2
P2
U
V
W
U
V
W
N3
N3
N3
Point of Measurement
Judgment Criteria Remarks
+–
No.
0.3 ~ 0.7V
1.2V and over
1.2V and over
Due to condenser charge
and so on, resistance
measurement may require
some time.
Due to condenser charge
and so on, resistance
measurement may require
some time.
P2
P2
P2
U
V
W
N3
N3
N3
U
V
W
1
2
3
4
5
6
7
8
9
10
11
12
P2
P2
P2
U
V
W
U
V
W
N3
N3
N3
To use digital tester:
Measurement is executed in the diode check mode. ( )
[PCB and Circuit Diagram]
P3
UV W
N3
J1
J2
J3
P1
P1 P2
IGBT
X11A
UVW
L1
L2
L3
X10A
DM
K2
P3
N3
(V2895)
J1
J2
J3